Instrument for indicating speeds, distances covered, and the like.



PTENTED-qAN-zm .1908.-

5. v GRA'rz.

'INSTRUMENT For; INDICATING' .SPBBDQDISTA Noris COVERED, AND THE LIKE.

- l uhm A y @FFQE UNITED s'rn'r i;

EUGENE VICTOR GRTZE, OF LEYTONSTONE, ENGLAND.

milioni nel October i6. i906. Serial NOUSSQRZL To alt whom it may concern:

l Be it known that l, .EUGENE Vieron GRATZE, a subject of the King of Great Britain, and a resident of "Neodhayne,7 l

yMaple road, Leytonstone, Essex, England,

have linvented a new and useful Instrument *for indicating Speeds, Distances Covered,

.and the Like, 'of which the following-is the specification.

This invention rela-tes to improvements in instruments for indicating speeds and distances covered. lt may indicate the number of revolutions per minute, or it may record the distance traveled. lt may be connected tothe shaft ci any rotary machinery, or to motor-driven vehicles or the like.

The deflection of the indica-ting movement -in prior indicators oi this type has 'been effected by revolving a magnet or magnets round a central core and conductor, or by revolving a conductor round a central core voi conducting metal piaced near or beti'vee'n the speed.

`it exerts a dragproportional to its speed and also to tlie'iiumber oi magnetic lines it cuts. per unit or' time.-

, The action of this apparatus depends upon a revolving conducting armature' or core (inside a metallic cylinder or case) turning between the poles oi' 'a permanent magnet. This magnet is stationary and made in circular forni, the pole pieces being semi-cir cular and` just large enouglrto contain (between their faces) the larmature and metal cylinder or case, in suoli a manner that ltlie latter may both turniieely. The walls of' the conducting cylinder or indicatingmovement are'very thin'. between the magnet poles and the armature or core are reduced to a minimun'i and do not offermucli resistance to the lines of' torce.l

ln addition, the movement is ot a maximum,

lightness. v

' The magnet lhas practically a closed circuit, so that it is able to retain its full,

Therefore the air l strength for an unlimited time. Moreover,

as the magnet doe/s not revolve, it is not alfected by vibration or external fields.

`Also, asitis almost a. complete circle, it may i be made"comparatively smaller to retain a greater strength of magnetism than would Specicaticn of Letters ".atent.`

otherwise be the case. `The armature or core revolves, and, being constructed oi conducting metal, induces the lines of Jforce through. the walls of the metal cylinder or case within which it turns, thereby creating eddy currents and exerting a drag upon it. The invention is illustrated by the'accompanying drawings, -in which-- Figure l is an elevation oi the internal vmechanism with the dial removed, Fig. 2 is a vertical section of F ig. 1, Fig. 3 is a horizontal section of F ig. 1,' showing the mechanism with part of the cover, dial, magnet, base and movement cut away.

M is a permanent magnet; placed centraliy between the poles of the magnet is a c onduct-ing armature or core A,whicli revolves round a. spindle S. ln Ythis latter set a diewel il, The metal cylinder or case C, is suspended or balanced between the jewels J and il. This allows the walls of the metal cylinder C to turn freely in the gaps left between the two magnet poles and the edges of the conducting core or armature ifi. The' driving medium is attached to the spindle B, thereby trainen-rit ting themction 'to the spurwheel ll" through the medium oi the spur wheel W', as shown in 7nig. 2. T he spur wheel lV is iixed to the armature A. by a metal collar D. The armature A, revolving inside the cylinder or case C, tends to drag the latter round with it, but iis pull or drag is controlled by a spring N, which limits the deilection and causes saine to become proportional to the speed ci the arnw; ure. iherefore, as the speed of the armature or core fi increases, the dellection 1 ci the case (l increases also, this deflection being calibrated oil' on a. suitable scale in miles per hour, reifolutions per minute or anyv other quantity requiring to be indicated.

i"he register il. is driven by a worin T ihrough the medium ol a suitable toothed wheel i). 'lf he mechanism is mounted on a suitable base E, contained in a case or cover F, and the indicating hand moves over a scale fixed to a dial G. A clamp ll ismechanically operated to 'clamp or clutch the niovenient P, should it be desired to hold the latter in any temporary iixed position. is'. is a suitable glass set in the'cover.

What l claim as my invention and desire f to secure by Letters Patent is i. ln combination, a substantially annular stationary magnet, a revolving core positioned between the poles oi the magnet, a'

Patented Jan. es, 190s.

metallic casing adapted to embrace thecore core, and indicating ,operated the 'and extending 'beyond -both sides thereof, casmg.

spring means for controlling the rotation of In testimony whereof I have signed my the casing, indicating means operated by the name to this speciication in the presence ot casing, and means for rotating thecore. Y the two subscribing Witnesses. 2. In combination, 4a stationary magnetV EUGENE VICTORGRTZE,` v substantially annular having conoaved ter- Witnesses: Y

minals positioned betweenthe terminals of JAS. D. ROOTS,

the magnet, a metallic'casing embracing the 'H, D. JMEsoN. 

